riscv pmap: zero reserved pte bits in ppn for l2 leaf entries, too

[freebsdphab-AX9_cmx.ietfng.org]

Summary

D25523 / 0f7e7ff80e960e90a9acfc3e417465a7a0428e3c masked out the reserved bits from PTEs for the smallest page size. Do the same for larger pages.

[mhorne]

sys/riscv/riscv/pmap.c

344

It is fine to name it L2PTE_TO_PHYS I think. Generally within the riscv pmap we refer to leaf entries of any size as PTEs and non-leaf entries as PDEs (page directory entries).

[freebsdphab-AX9_cmx.ietfng.org]

Renamed macro as per mhorne's feedback